Covid-19 analysis from the multicenter, prospective, observational invidia-2 study (Influenza Vaccine Indication During Therapy With Immune Checkpoint Inhibitors: A Transversal Challenge)-a ficog study

ABSTRACT

Background: The prospective, multicenter, observational INVIDIa-2 study was designed to investigate the clinical efficacy of influenza vaccination in advanced cancer patients receiving immune checkpoint inhibitors (ICIs) from October 2019 to January 2020. The primary endpoint was the incidence of influenza-like illness (ILI) until April 30, 2020. All ILI episodes, laboratory tests, complications, hospitalizations and pneumonitis were recorded. Therefore, the INVIDIa-2 study prospectively recorded all the COVID-19 ILI events. Methods: Patients were included in this non-prespecified COVID-19 preliminary analysis if potentially exposed to Sars-Cov-2 infection, namely alive on January 31, 2020, when the Italian government declared the National emergency. The incidence of confirmed COVID-19 was assessed among patients with ILI symptoms, describing the hospitalization rate and mortality. Cases with clinicalradiological diagnosis of COVID-19 without laboratory confirmation (COVID-like ILIs), were also reported. The COVID-incidence was exploratively compared basing on influenza vaccination. Results: 1260 patients receiving ICI were enrolled between October 2019 and January 2020;955 patients were analyzed according to the inclusion criterion. Of them, 66 patients had ILI from January 31, to April 30, 2020. 9 were COVID-19 ILIs with laboratory test confirmation. The COVID-19 ILI incidence was 0.9% (9/955 cases), with hospitalization rate of 100% and mortality rate of 67%. Including 5 COVID-like ILIs, the overall COVID-19 incidence was 1.5% (14/955), with hospitalization in 100% of cases and mortality rate of 64%. COVID-19 incidence was 1.2% for patients vaccinated against influenza (6/482 cases) and 1.7%, among unvaccinated patients (8/473 including 3 confirmed COVID-19 and 5 COVID-like), p = 0.52. The difference was not statistically significant, and the clinical trend in favor of vaccinated patients was lost when considering only confirmed COVID-19 (1.2% in vaccinated vs 0.6% in unvaccinated patients, p = 0.33), probably due to the greater presence of male and elderly patients in the vaccinated group (p = 0.009). Conclusions: We obtained the first prospective epidemiological data about symptomatic COVID-19 in advanced cancer patients receiving ICIs. The overall symptomatic COVID-incidence is meaningful, requiring hospitalization in all cases and leading to a high mortality rate, likely due advanced cancer more than to ICI therapy [Mengyuan Dai, Cancer Discov 2020].